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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15304a0afddd8e01a6945f2501878bbdfb0adb71a94e5230d9adc4fe70da3f73' 
  AND token = 'RCi99tUxccm221tSXtHKLnBmX5vT3ofL+vFPGjSko4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}